Skip legend with empty line

Hi folks,

I found specifying Matlab legend confusing when I have a line that could be empty (then has an empty handle). I want to skip the legend for empty line. For example:

h1 = plot([]);      % Blue line
hold on;
h2 = plot(rand(1,10),'r');  % Red line
h3 = plot(rand(1,10),'g');  % Green line
legend([h1 h2 h3],{'want to withdraw this if line unexist', 'hello', 'world'});

In this case, the legend for h1 will be assigned on h2, and the legend for h3 will be ignored.

Do you have any better solution rather than doing (since I might have different lines empty or not, and I just want the matched legends):

h1 = plot([]);      % Blue line
hold on;
h2 = plot(rand(1,10),'r');  % Red line
h3 = plot(rand(1,10),'g');  % Green line
if ~isempty(h1)
  legend([h1 h2 h3],{'want to skip this if line unexist', 'hello', 'world'})
else
  legend([h2 h3],{'hello', 'world'})
end

Thanks!

Answer 1

[Star Strider]

Try this:

h1 = plot([], 'DisplayName','want to withdraw this if line unexist');      % Blue line
hold on;
h2 = plot(rand(1,10),'r', 'DisplayName','hello');  % Red line
h3 = plot(rand(1,10),'g', 'DisplayName','world');  % Green line
legend('show')

[Zheng Liu]

Awesome! Thanks!

[Star Strider]

As always, my pleasure!

[J D]

I had a similar problem, this is perfect! Thanks.

[Star Strider]

My pleasure!